Hydraulic unit



HYDRAULIC UNIT Filed July 20 1931 2 Sheets-Sheet 2 INVENTOR W22 2. zamif ad Patented June 27, 1933 UNETED STATES PATENT series WILLIAM J.FIEGEL, F DETROIT, MICHIGAN, ASSIGNOB, TD BOI-IN ALUMINUM AND BRAgSCORPORATION, OF DETROIT, MICHIGAN, A COR-PGBAT'IOIT OE MICHIGANHYDRAULIC UNIT Application filed July 20,

his invention relates generally to hydraulic systems and moreparticularly to a construction and arrangement of parts tending torender more efiicient and improve generally systems of this character.

The invention contemplates minimizing leakage and obtaining a morecompact unitary assembly by locating the cont-r01 valve and filteringdevice for the system within the supply tank therefor in such a manneractuation of the latter automatically oper ates the filtering device toclean the same.

The foregoing as well as other objectswill be made more apparent as thisdescription proceeds, especially when considered in connection with theaccompanying drawings, wherein:

Figure 1 is a sectional side elevational View of the fuel tank assembly;

Figure 2 is a longitudinal sectional View through the control Valve;

Figure 3 is a central sectional view through the filtering device.

Referring now to the drawings, it will be noted that there isillustrated in Figure 1 a reservoir or tank 10 adapted to. contain asupply of lubricant or other suitable liquid and preferably supportedupon a standard 11. Locatedwithin the supply tank 10 in such a manner asto be immersed in the fluid therein is a control valve 12 and afiltering device 13;

The control valve 12 is preferably of the reciprocable piston type andmay be identical in construction to the valve described with someparticularity in my copending ap plication, Serial No. 538,386, filedMay 18, 1931. As shown particularly in Figure 2, the

1931. Serial No. 552,660.

valve 12 illustrated herein comprises a casing 14: having spacedopenings 15 and 16 therein communicating with the points ofdistribution. For the purpose of illustration, it may be assumed thatthe openings s 15 and 16 communicate with opposite ends of ahydraulically operated pump (not shown) for reciprocating the pistontherein. The casing is further provided intermediate the openings 15 and16 with a third opening 17 communicating with a suitable gear pump 18.The gear pump is preferably arranged exteriorly of and below the supplytank 10 as shown inFigure 1 and is secured to the valve casing to form aunitary construction by means of the bolts 18'. The pump is also rigidlysecured to the bottom, wall 19 of the tank in such a manner as toprovide a fluid-tight connection and com municates with the interior ofthe tank by means of a passage 20.

The flow of fluid through the openings 15 and 16 is controlled by meansof a piston type valve 21 reciprocably mounted within a bore 22extending longitudinally through the casing. The piston 21 is soconstructed that in the intermediate position thereof shown in Figure 2the fluid discharged by the pump 18 is merely by-passed around thepiston and prevented from flowing into either of the openings 15 or 16.On the other hand, when the piston 21 is in its extreme right-handposition as viewed in Figure 2, communication is established between theinlet opening 17 and the opening 16 in the casing so as toss conveyfluid under pressure into one side of the hydraulically actuated pump tomove the piston therein in one direction. In thisconnection, it is to benoted that when the piston valve 21'is in the position above-mentioned,it also establishes communication between the opening 15 and the exhaustopening 23 in the casing, with the result that any fluid upon thecompression side of the hydraulically actuated pump will be dischargedthrough the valve 12 into the supply tank.

' Movementof the piston to its extreme lefthand position as viewed inFigure 2, establishes communication between the lnlet openg 7 and. theopening 15 permitting fluid 1 end of the pump and under pressure of thepump. piston conducted back through the valve 12 out of the exhaustopening 23 therein. As previously stated, the exhaust opening 223communicates with the filtering device by means of the condu t so thatthe fluid returned by the hydraulic pump instead of exhausting directlyinto the casing is d s charged into the filtering device 13 through theinlet opening 28 therein. As the fluid, accumulates in'the casing of thefilterng device, it is compelled to flow out of the outlet opening 29 inthe casing into the supply tank and since it is necessary for thelubricant to pass between the cleaning disks 36 prior to flowing out ofthe outlet opening 29, it will be apparent that all of the fluidexhausted from the valve will be filtered prior to reentering the supplytank. Thus, in view of the foregoing and in view of the fact that thefiltering device is automatically cleaned upon reciprocation of thevalve piston controlling the flow of fluid into the latter, it will beapparent, that efli'cient operation of 7 the filtering device to cleanthe fluid is insured.

I For draining the liquid from the tank 10, I provide a suitable drainconduit having one end communicatng with the pump 18 through the bottomwall thereof and having the opposite end communicating with a suitablevalve (not shown). The liquid level in the tank is visibleat all timesby means of a gage 51 comprising a transparent tube arranged. exteriorlyof the tank and having the opposite ends communicating therewith atpoints adjacent the top and bottom thereof through suitable valves 51 asclearly shown in Figure 1 of the drawings.

If desired, a pressure gage diagrammatically illustrated at 52 may bearranged adjacent the 51 for indicating the pressure of the fluiddischarged by the pump.

As shown particularly in Figure 1. the gage 52 communicates with thepump by means of a conduit 53 having one end communicating with the gageand the opposite end communicating with the pump adjacent the dischargeopening thereof.

What I claim as my invention is 1. A hydraulic system having incombination, a fluid supply tank, a valve located within the tank andhaving movable means for controlling the distribution of fluid from thetank, filtering means for the fluid also located within said tank andhaving a filtering member and a cleaning member, one of said membersbeing movable relative to the other for cleaning the filtering member,and an operative connection between the movable member and control meansfor actuating the former upon movement of the latter.

2. A hydraulic system having in combination, a fluid supply tank, avalve located within the tank and having a reciprocable valve piston forcontrolling the distribution of fluid from the tank, a filtering devicefor the fluid also located within said tank, said device comprising a.filtering member and a cleaning member, one of said members beingrotatable relative to the other for cleaning the filtering member, andmeans operatively connecting the rotatable member to the valve pistonwhereby reciprocation of the latter effects rotation of the former.

3. A hydraulic system having in combination, a valve having acasingcommunicating with a fluid supply and having exhaust and outlet openingstherein, a valve member movable within, said casing for controlling theflow of fluid through said openings, a filtering device having intakeand outlet openings communicating respectively with the exhaust openingin said casing and source of fluid supply, said device having afiltering member and a cleaning member, one of said members mounted forrotation relative to the other for cleaning said device, and anoperative connection between the movable valve member and rotatablemember of the filtering device for effecting rotation of the latter uponmovement of the former.

4:. A hydraulic system having in combination, a valve having a casingcommunicating with a source of fluid supply and having a valve membermovable within said casing for controlling the flow of fluidtherethrough, a filtering device for the fluid having cleaning andfiltering members mounted therein for movement relative to each other toclean said device, and an operative connection between said valve memberand one of the members in said device for'actuating the latter uponmovement of the former.

5. A hydraulic system having in combination, a fluid supply tank, avalve assembly located within'said tank and having a casing providedwith intake and exhaust openings for fluid, a valve member r-eciprooablymounted in said casing for controlling the flow of fluid through thevalve casing, a filtering device also located within said tank andhaving intake and outlet openings therein respectively communicatingwith the exhaust opening in said casing and fluid in said tank, saiddevice further having filtering and cleaning members mounted forrelative rotation to clean the device, and an operative connectionbetween the valve member and one of the members in said device forrotating the latter member upon reciprocation of the valve member.

6. A hydraulic system having in combination, a fluid supply tank, afiltering device for the fluid located within said tank and having acasing for receiving the fluid provided with drainage means extendingthrough one wall of the tank whereby the fluid in said casing may bedrained therefrom without interfering with the fluid in said tank. I r

' 7 A hydraulic system having in combination, a fluid supply tank, avalve located within the tank and having movablei means for controllingthe distribution of fluid from the tank, filtering means for the fluidalsolocated within said tank and having a filtering member and acleaningmember, one of said members being movable relative to the otherfor cleaning the filtering member, an operative connection between themovable member and control means of the valve for actuatin theformerupon movement of the latter an means; accessible from a pointexteriorlyof the tank for draining the filterin device withoutinterfering with the flui in the tank.

' 8. A hydraulic system having in combination avalve, a valvecasingcommunicating with asource of fluid supply and having a movable valvemember therein for controlling the flow of fluid thorethrough, afiltering device for the fluid having means in association therewith forcleaning the'sanie, and means operatively connecting the valve member tothe means aforesaid of the filtering device for actuating said means toclean the device upon'movement of the valve member.

' 9. A hydraulic system havingin. combination, a valve casingcommunicating with a source of fluid supply and having a valve membermovable therein for controlling the flow of fluid therethrouglnafiltering device for the fluid having means in association therewith forcleaning the same, and means 0 erable independence upon the movement 0?said valve member for periodically actuating the means aforesaid of thefiltering device to clean the latter.

10. A hydraulic system having in combination, a fluid supply tank, avalve casing located within the tank and having a valve member movabletherein for controlling the flow of fluid therethrough, a filteringdevice also located within the tank and having a casing communicatingwith the valve casing for receiving fluid therefrom, means associatedwith thefilterin g device for cleaning the same, and means responsive tothe movement of the valve member for periodically actuating the meansaforesaid to clean the filtering device.

11. A hydraulic system having in combination, a fluid supply tank, avalve assembly located within said tank and having a casing providedwith intake and exhaust openings, a valve member movable within saidcasing for controlling theflow of fluid through said openings, anauxiliary casing also located within the tank and having inlet andoutlet openings communicating respectively with the exhaust opening inthe valve casing and interior of the tank, and filtering means withinthe auxiliarycasing between the inlet and outlet openings therein forcleaning thefluid prior to discharging the same into the tank.

In testimony whereof I affix my signature.

1 WILLIAM J FIEGEL.

llu

June 27, 1933. "J, J. FINDLATER 1,915,657

METHOD OF MAKING A COMPOSITE DIE ELEMENT Filed June 28, 1930" I h fig /0i BY I i QM M AM v %6R 5.

